PDAs have long been used by doctors and healthcare workers to help them make decisions on the wards. Perhaps this innovative technology demoed at the TED conference is the next evolution of the 'peripheral brain' idea. The device is a combination projector (so you don't need a screen) and a camera to record your hand movements and identify what you are looking at. The processing is done in a mobile phone in your pocket.
With something like this you could perhaps project MRI data onto a patient so you could see 'inside' them as you examine them. There are a million other potential uses - identifying drugs from their shapes, checking the correct patient (or correct side of the body) you are about to operate on, displaying patient records without needing to go to a computer or lug around a laptop, etc, etc.